Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
5 (2)
Book Image

The Go Workshop

5 (2)
By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1. Variables and Operators
2. Logic and Loops

Exported and Unexported Code

Go has a very simple way to determine whether code is exported or unexported. Exported means that variables, types, functions, and so on are visible from outside of the package. Unexported means it is only visible from inside the package. If a function, type, variable, and so on starts with an uppercase letter, it is exportable; if it starts with a lowercase letter, it is unexportable. There are no access modifiers to be concerned with in Go. If the function name is capitalized, then it is exported, and if it is lowercase, then it is unexported.


It is good practice to only expose code that we want other packages to see. We should hide everything else that is not needed by external packages.

Let's look at the following code snippet:

package main
import ("strings"
func main() {
  str := "found me"
  if strings.Contains(str, "found") {